AA batteries (also known as penlite batteries) are the most popular type of battery. Here you can also find rechargeable versions that you can use in combination with a Battery Charger.They're used for powering small devices, varying from remote controls and portable speakers to bodypacks for wireless microphones. Their capacity (expressed in mAh) varies per type, the higher the capacity, the longer the battery will last. Their voltage is usually around 1.5 volts. There are also devices that work on AAA Battery (or mini penlites) that look the same as the AA battery, but are one size smaller. Other types of batteries can be found in the main category Batteries & Chargers.